XML 44 R97.htm IDEA: XBRL DOCUMENT v2.4.1.9

Net Income Per Share - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Stock options and restricted stock units outstanding	747,000mksi_NumberOfSharesOutstandingStockOptionsAndRestrictedStockUnits	868,000mksi_NumberOfSharesOutstandingStockOptionsAndRestrictedStockUnits	1,198,000mksi_NumberOfSharesOutstandingStockOptionsAndRestrictedStockUnits
Number of shares excluded from computation of diluted earnings per share	600us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	83,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	204,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

X

- Definition

Number of shares outstanding stock options and restricted stock units.

+ References

No definition available.

+ Details

Name:	mksi_NumberOfSharesOutstandingStockOptionsAndRestrictedStockUnits
Namespace Prefix:	mksi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Antidilution

-URI http://asc.fasb.org/extlink&oid=6505113



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

-URI http://asc.fasb.org/extlink&oid=6510752



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Contingent Stock Agreement

-URI http://asc.fasb.org/extlink&oid=6508534

+ Details

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_EarningsPerShareAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration